[18] VPR: Subsequent VPR hibernate sleeps might fail to save ra

nRF54L15 Revision 2 Errata

This anomaly applies to Revision 2, build codes QFAA-C00, CAAA-C00, QDAA-C00, QGAA-C00.

It was inherited from the previous SoC revision Revision 1.

Symptoms

GPR x1 (ra) is not updated.

Conditions

VPR enters sleep in VPR hibernate mode multiple times without powering down.

Consequences

The VPR application might misbehave.

Workaround

After waking up from sleep in VPR hibernate mode, issue an APB write with VPR anywhere inside its own RTP or CPUCTRL peripheral address range.